Can we compile a java program without main?

Correct Answer: Inheritance is the ability to create new classes based on existing classes It is useful to reuse existing code

Correct Answer: Encapsulation describes the ability of an object to hide its data and methods from the rest of the world

Correct Answer: Java uses sand box security model

Correct Answer: The diamond problem is an ambiguity that can occur when a class multiply inherits from two classes that both descend from a common super class

Correct Answer: Array is collection of same data type Array size is fixed, It cannot be expanded But ArrayList is a growable collection of objectsArrayList is a part of Collections Framework and can work with only objects

Correct Answer: Overridden methods must have the same name, argument list, and return type (ie, they must have the exact signature of the method we are going to override, including return type) The overriding method cannot be less visible than the method it overrides( ie, a public method cannot be override to private) The overriding method may not throw any exceptions that may not be thrown by the overridden method

Correct Answer: Path and Classpath are operating system level environment variales Path is used define where the system can find the executables(exe) files and classpath is used to specify the location class files

Correct Answer: A method declared as final can't be overridden A sub-class can't have the same method signature with a different implementation

Correct Answer: A static initializer block is a block of code that declares with the static keyword It normally contains the block of code that must execute at the time of class loading The static initializer block will execute only once at the time of loading the class only

Correct Answer: When an exception is thrown , the catch block of the try statement are examined in the order in which they appear The first catch block that is capable of handling the exception is executed The remaining catch blocks are ignored